Do William and Harry Have a Full Sister?
Prince William and Prince Harry do not have a full sister. They are the only two children of King Charles III and the late Diana, Princess of Wales. Their immediate family includes one sister, Princess Charlotte, and one brother, Prince Louis, who are both younger siblings of William and Harry. Royal.uk lists the children of Charles and Diana as William, Harry, Charlotte, and Louis.
Because William and Harry share the same parents, their half-siblings from Charles's second marriage to Queen Camilla do not count as full sisters. The only full sister to William and Harry is Princess Charlotte. The family structure is therefore William, Harry, Charlotte, and Louis, with no additional full sisters born to Charles and Diana.
Who Are the Other Siblings of William and Harry?
Princess Charlotte Elizabeth Diana was born on May 2, 2015, and Prince Louis Arthur Charles was born on April 23, 2018. Both are younger siblings of William and Harry and share the same parents. Charlotte is the only full sister to the princes, while Louis is their only full brother.
William and Harry also have half-siblings from their father's marriage to Queen Camilla. Their half-siblings are Prince George, Princess Charlotte, and Prince Louis from Camilla's previous marriage, but these are step-siblings, not full siblings. BBC News confirms the distinction between full and half-siblings in the royal household.
Where Do William and Harry Stand in the Line of Succession?
Prince William is the eldest son of King Charles III and is first in line to the British throne. Prince Harry is second in line, followed by their children. Royal.uk lists the current order as William, then Harry, then William's children George, Charlotte, and Louis, then Harry's children Archie and Lilibet.
Princess Charlotte is not in direct line to the throne ahead of her uncle Harry because succession rules place children of the eldest son ahead of siblings. The Succession to the Crown Act 2013 ended male-preference primogeniture for those born after October 28, 2011, but the order still follows birth order within each generation. UK Parliament provides the official details of the 2013 reform.